2005 ktm 525 jetting with akrapovic ?

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Ihave 2005 KTM 525 exc with akrapovic "slip-on" exthaust system with standart head pipe. I have tested jetting with different configurations but still have problem. Bike will keep "popping" when closing throttle from speed.

I have 178 /45/ 3rd from top with air srew 2 1/4 open, any comments to solve this out ? I have tried with 185 main jet, but this does not help.

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Decel popping is not jetting, it is cold air leaking in at the head/head pipe junction. When the throttle is closed, the vacumme is so high that during the overlap stroke it will suck air back into the engine, when that cold air hits the exhaust pipe it causes a re-burn of the hot spent gases.

Best plan is to remove the pipe, coat the conection with hi temp silicone sealer, make very certain the pipes are on as far as posable, none of the mounts holding it forward, let the silicone dry overnight before starting.